yifanmai opened a new pull request #13359: URL: https://github.com/apache/beam/pull/13359
#13202 introduces a bug where the algorithm that determines the parents of
fused stage can create loops, because the lowest common ancestor algorithm
considers a transform to be its own parent. Fusing a single transform A will
result cause the fused stage's parent to be set to A. Fusing a transform A with
a descendant B will also cause fused stage's parent to be set to A. To fix
this, if the parent of the fused stage would be one of transforms to be fused,
set the parent to the parent of that transform instead.
This is a cherry pick of #13303.
------------------------
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